As inevitable as the tides rolling in: every time a new Windows version is released, someone with too much time on his hands tries to install it on extremely outdated hardware. Sure, it won't be usable by any standard whatsoever, but it's still a fun thing to do. Of course, Windows 7 couldn't lag behind.

Still have a Compaq laptop running at 133MHz and 64 MB. Still fast. It used W95 but now uses WME in a LitePC Install from http://www.litepc.com/
Still fast and usefull... but NEVER has touched the internet NOR had any new istalations besides the original intended (compilers and MAME-064)